Electric-arc lamp



(No Model.)

H. R. PALMER.

ELECTRIC ARC LAMP.

No. 571,137 Patented N0v.10,1896.

UNITED STATES PATENT OEEIcE.

HARRY ROOT PALMER, OF NORFOLK, YIRGINIA.

ELECTRIC-ARC LAMP.

SREGIIEIGATION forming part of Letters Patent No. 571,137, dated November 10, 1896.

gerial No. 584,825. (No model.)

To aZZ whom it may concern.-

Be it known that I, IIARRY ROOT PALMER, a citizen of the United States, residing at Norfolk, in the county of Norfolk and State of Virginia, have invented certain new and useful Improvements in Electric-Arc Lights; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation to improvements in electric-arc lights; and the object is to provide an electric-arc light with an adjustable stop or cut-out, whereby the descent of the upper carbon will be arrested, and the light may be extinguished at a determined time and obviate the use of several currents from a central station to be cut off at the desired time.

I accomplish the objects of my invention by the constructions and means illustrated in the accompanyingdrawings, forming a part of this specification, and wherein Figure 1 is a side view of a lamp of a wellknown kind having my invention applied thereto. Fig. 2 is a plan view of the conducting-frame, constituting a contact-piece against which the contact 011 the upper carbon impacts to shunt or cut out the progress of the current to the lower carbon. Fig. 3 is a perspective of the circular contact-piece attached to the upper carbon.

A designates an electric-arc light or lamp of a well-known construction and parts, having the usual side bars 1 1 sustaining the frame and socket support of the lower carbon.

\Vhile I have illustrated the invention as applied to the lamp of a well-known conare lined with an insulating substance 5, substantially as shown. The frame is held to the lamp-bar by means of clamping-bolts and nuts 6 6 projected through insulatingsleeves 7, substantially as shown. On the inner ends of the bars 2 2 is connected a platinum or German-silver tip 3, with which the descending contact-piece on the carbonrod contacts to shunt the circuit. On the outer end of each bar of said frame is mounted and arranged a suitable binding-post 8 8 in which the wires 9 9 of the cut-outor shunt circuit are connected and held, as shown in the drawings. The other ends. of the wires 9 9 are carried above the head of the lamp and secured so as to complete the circuit to the main wire or leader. This contact-frame, it will be perceived, is readily adjustable on the side or frame bar of the lamp, higher or lower, thus determining the length of time or the period when the lamp is to be cut out of the circuit. On the carbon-rod B is fitted a circular contact-piece 10, adjacent to the carbon-clamp 11 and having a downwa-rddi rected serrated flange 10 preferably consisting of platinum or German-silver tips to make a more indestructible connnunication with similarly-tipped conductors of the conducting-frame.

It will now be perceived that when the lamp has been trimmed or supplied with a carbon in the upper-carbon rod the contactpiece 011 the carbon-rod will be at the top of the lamp-frame and above the contact-frame clamped to the side bar of the lamp, and that when the carbon burns down until the contact-piece on the carbon-rod makes contact with the inner ends of the contact-frame the circuit between or through the carbons will be cut out or shunted and directed over the contact-frame, and since the contact-frame on the lamp-bar may be adjusted to make the contact at any desired place this cut-out will be made in a longer or shorter time, according to the position of the adjustable contact on the frame of the lamp.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In an electric-arc light, the combination of the movable carbon-rod of the upper carbon, a contact-piece on the said rod, a contact-frame ad justably clamped to and insulated from the frame-bar of the lamp, and a shunting-circuit leading from the outer ends 0f the contact frame to the main circuit, whereby the circuit is cut out of the carbons.

2. In an electric-are light, the combination of the movable carbon-rod of the upper car- 5 b011, a contact-piece 0n the said rod formed with a serrated downward-extending edge flange, a contact-frame adj ustably secured to the lamp-bar and comprising two bars insulated from the lamp-bar to which it is se- 10 cured, and having their inner ends arranged in the path of the contact-piece on the carbon-rod, and a shuntcireuit leading from the outer end of the contact-frame to the main circuit, substantially as set forth.

I11 testimony whereof I hereunto ai'lix my 15 signature in presence of two witnesses.

HARRY ROOT PALMER. \Vitnesses CHAS. E. DAVIS, Rosa- E. BRO\VN. 

